CA1211142A - Pneumatic conveying and material blending apparatus and method - Google Patents
Pneumatic conveying and material blending apparatus and methodInfo
- Publication number
- CA1211142A CA1211142A CA000450036A CA450036A CA1211142A CA 1211142 A CA1211142 A CA 1211142A CA 000450036 A CA000450036 A CA 000450036A CA 450036 A CA450036 A CA 450036A CA 1211142 A CA1211142 A CA 1211142A
- Authority
- CA
- Canada
- Prior art keywords
- bin
- column
- vessel
- inlet
- solid particulate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
- B01F33/405—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles having guiding conduits therein, e.g. for feeding the gas to the bottom of the receptacle
- B01F33/4051—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles having guiding conduits therein, e.g. for feeding the gas to the bottom of the receptacle with vertical conduits through which the material is being moved upwardly driven by the fluid
- B01F33/40511—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles having guiding conduits therein, e.g. for feeding the gas to the bottom of the receptacle with vertical conduits through which the material is being moved upwardly driven by the fluid with a central conduit or a central set of conduits
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
ABSTRACT OF DISCLOSURE
A pneumatic conveying and material blending system and method which includes a bin having an open-ended vertical column mounted therein with the bottom of the column being spaced from the bottom of the bin. The material inlet is located in the bottom of the bin and a pneumatic conveying system supplies material to be blended from a source to the material inlet and conveys the material upwardly through the column so that material is discharged from the top of the column in the manner of a geyser whereby it is spread over the top surface of material already in the bin. The material already in the bin is drawn into the bottom of the column so that material already in the bin is blended with material being conveyed to the bin. A deflector is positioned over the top of the column to aid in spreading the incoming material. Booster gas can be supplied through a section of the bin adjacent the bottom of the column. This gas may be supplied by using a vacuum applied to the bin through a vent in the bin or by a blower supplying air or gas directly to a manifold surrounding the gas permeable surface. The outlet of the bin is coextensive with the inlet of the bin so that material is drawn out of the central opening in the bottom of the bin.
Internal recirculation is also contemplated by this invention.
A pneumatic conveying and material blending system and method which includes a bin having an open-ended vertical column mounted therein with the bottom of the column being spaced from the bottom of the bin. The material inlet is located in the bottom of the bin and a pneumatic conveying system supplies material to be blended from a source to the material inlet and conveys the material upwardly through the column so that material is discharged from the top of the column in the manner of a geyser whereby it is spread over the top surface of material already in the bin. The material already in the bin is drawn into the bottom of the column so that material already in the bin is blended with material being conveyed to the bin. A deflector is positioned over the top of the column to aid in spreading the incoming material. Booster gas can be supplied through a section of the bin adjacent the bottom of the column. This gas may be supplied by using a vacuum applied to the bin through a vent in the bin or by a blower supplying air or gas directly to a manifold surrounding the gas permeable surface. The outlet of the bin is coextensive with the inlet of the bin so that material is drawn out of the central opening in the bottom of the bin.
Internal recirculation is also contemplated by this invention.
Description
Z
I PNEUMATIC CONVEYING AND MATERIAL BLENDING APPRISE AND METHOD
I _ _ _ _ _ I
21 The present invention relates to pneumatic conveying systems 31 and in particular to a material blending system in combination 4¦ with a pneumatic conveying system. The invention while not 5 ¦ intended to be limited thereby is particularly applicable for use 6 ¦ in achieving a homogeneous quantity of material such as pellets 7 ¦ powders, and granular material.
8 ¦ Prior to the present invention, material blenders were known 9 ¦ including blenders for plastic pellets. Typical prior art 10 ¦ blenders for solid particulate material include gravity type 11 ¦ blenders wherein a plurality of withdraw tubes are mounted within 12 ¦ a bin and material is withdrawn from the bin through the tunes 13 ¦ which have openings at various levels within the bin. The with-14 ¦ drawn material is supplied to a conveying line where it is 15 ¦ usually recirculated back into the top of the bin for withdraw a 16 ¦ subsequent time. After a given number of recirculation cycles, 17 ¦ the material is sent to a use point. Typical of such blenders is 18 that shown in US. Patent No. 3,351,326.
19 Another type of blender includes a bin or silo with an aerated bottom wherein material to be blended is supplied to the 21 bin through an inlet in the top, a gas permeable silo bottom has I air supplied there through to aerate material within the bin or 23 silo. One section of the bin bottom is supplied with higher 24 pressure air to fluids material above that section so that material above that section spills onto other portions of the 26 silo. Material in the aerated sectionfi is drawn into the 27 fluidized section. The section which is fluidized is changed in 28 cycles A typical such apparatus is disclosed in US. Patent No.
29 2,844,361.
A further type of blender is a column blender such as what ,`"~
I lulls . .
I shown in US. Patent Nos. 3,648,9B5 and 3,729,175. In this type
I PNEUMATIC CONVEYING AND MATERIAL BLENDING APPRISE AND METHOD
I _ _ _ _ _ I
21 The present invention relates to pneumatic conveying systems 31 and in particular to a material blending system in combination 4¦ with a pneumatic conveying system. The invention while not 5 ¦ intended to be limited thereby is particularly applicable for use 6 ¦ in achieving a homogeneous quantity of material such as pellets 7 ¦ powders, and granular material.
8 ¦ Prior to the present invention, material blenders were known 9 ¦ including blenders for plastic pellets. Typical prior art 10 ¦ blenders for solid particulate material include gravity type 11 ¦ blenders wherein a plurality of withdraw tubes are mounted within 12 ¦ a bin and material is withdrawn from the bin through the tunes 13 ¦ which have openings at various levels within the bin. The with-14 ¦ drawn material is supplied to a conveying line where it is 15 ¦ usually recirculated back into the top of the bin for withdraw a 16 ¦ subsequent time. After a given number of recirculation cycles, 17 ¦ the material is sent to a use point. Typical of such blenders is 18 that shown in US. Patent No. 3,351,326.
19 Another type of blender includes a bin or silo with an aerated bottom wherein material to be blended is supplied to the 21 bin through an inlet in the top, a gas permeable silo bottom has I air supplied there through to aerate material within the bin or 23 silo. One section of the bin bottom is supplied with higher 24 pressure air to fluids material above that section so that material above that section spills onto other portions of the 26 silo. Material in the aerated sectionfi is drawn into the 27 fluidized section. The section which is fluidized is changed in 28 cycles A typical such apparatus is disclosed in US. Patent No.
29 2,844,361.
A further type of blender is a column blender such as what ,`"~
I lulls . .
I shown in US. Patent Nos. 3,648,9B5 and 3,729,175. In this type
2 ¦ of apparatus, a hollow open-ended column is mounted centrally
3 ¦ within a bin. The bin is provided with a top material inlet and
4 ¦ a gas permeable bottom for aerating or fluidizing material within
5 ¦ the bin. Higher pressure air is supplied into the bottom of the
6 ¦ column to draw material in the bin into the column for movement
7 ¦ up through the column in the manner of an air lift for dispersal
8 ¦ onto the top surface of the material in the bin. While such
9 ¦ apparatus has an advantage of blending poulticed material, it
10 ¦ has a disadvantage that the blending takes a substantial period
11 ¦ of time, the means for supplying the material to be blended to
12 ¦ the bin is not fully utilized and high energy is required to
13 ¦ achieve the blending of material.
14 ¦ A further type of blender for pulverized material is shown
15 ¦ in US. Patent Nos. 3,148,~64 and 3,148,865 wherein material is
16 pneumatically conveyed into the bottom of a bin and the action of
17 the material entering the bin serves to blend material already in
18 the bin with material being supplied thereto. The apparatus and
19 method disclosed by these two patents is particularly useful for very fine gained material such as talc. The apparatus shown in 21 these two patents has not achieved wide acceptance and requires 22 several feed points for the material into the bottom of the bin.
23 A blender which combines some of the features of the prior 24 art is shown in US. Patent No. 3,276,753 wherein a device is sown which is capable of being filled with material to be 26 blended from either a top fill point or a bottom fill point which 27 is directly connected to an air lift column mounted in the 28 material bin. With that device it was considered that some 29 blending occurred in the filling of the bin, it was apparently considered necessary to have withdrawal from several points and 31~
I external recirculation of material to achieve adequate blending.
2 ¦ By the present invention, Applicants have provided a 3 ¦ blending apparatus and system which is capable of combining the 4 ¦ advantages of several of the prior art blenders and is able to do 5 ¦ so at an economical cost. With the present invention a bin 6 ¦ already in existence which is presently being used for storage 7 ¦ can be converted by an economical means to a blending system 8 ¦ which is particularly adapted for use with plastic pellets such 9 ¦ as polyethylene pellets. The invention is also suitable for all 10 ¦ solid particulate material including but not limited to cement 11 ¦ raw meal, powders, sand and the like.
12 ¦ The present invention has several advantages over the prior 13 ¦ art blenders in that is utilizes the conveying system energy to 14 ¦ not only supply material to the storage bin but also to provide 15 ¦ continuous blending of the material from the beginning of the 16 ¦ filling cycle to the end of the filling cycle to thereby cut down 17 ¦ on production time and save energy. The blender of the present 18 invention saves substantial capital investment by a simple con-19 struction of a single blender column because material it supplied to the bottom of the blender and removed from the bottom of the 21 blender. Less piping is required when compared to prior art 22 devices where material is supplied to the top of the blending 23 bin. The blender can eliminate the external piping associated 24 with a tube type gravity blender when required for material recirculation. While internal circulation of materials is 26 contemplated by thy present inventiorl, blending internally -27 results in less depredation of product when compared to external 28 recirculation.
29 With the blender of the present invention, a means is pro-voided for supplying a booster or fluidizing gas to the bottom of lo 142 I ¦ the bin to not only improve blending capability but also to serve 2 ¦ to deduct or clean the material and remove or vent gas which may 3 be trapped within the bin or vessel. Boost gas can also be used 4 to aid in the transfer of material to other destinations after blending is completed. The boost gas or fluidizing gas also 6 assists in the uniform flow of material, particularly during the 7 withdrawal of material from the bin.
9 It is, therefore, the principal object of this invention to provide a process and apparatus for blending for solid part-11 curate material such as pellets, granules, or powders which 12 provides simplified construction and maximum utilization of 13 energy.
14 It is a further object of this invention to provide a Noah-matte conveying and material blending system and method which 16 utilizes the energy used for pneumatic conveying to achieve the 17 blending of the material and utilizes the dust collector fan to 18 both reduce the energy required to blend the material and serve 19 as a pellet cleaning system and degasifying system.
The foregoing and other objects will be carried out by 21 providing in general a pneumatic conveying and material blending 22 system comprising a bin having an inlet for solid particulate 23 material in the bottom thereof; a hollow, open-ended vertical 24 column mounted in said bin, spaced from the bottom of said bin and spaced from and coccal aligned with the inlet for 26 material; means for supplying a stream of gaseous fluid and 27 entrained fresh solid particulate material to be blended to said 28 inlet and upwardly through said column and means for supplying 29 booster gas to the bottom of said bin to be directed upwardly into said column; said means for supplying a stream of gaseous lZ1~142 . .. .
. I fluid and said means for supplying booster gas defining means for 21 conveying solid particulate material already in the bin upwardly 31 through the column whereby said fresh solid particulate material 41 and said solid particulate material already in the bin are disk 5 ¦ pursed on the top surface of material in the bin to thereby blend 6 ¦ the material.
7 ¦ The foregoing and other objects will also be carried out by 8 ¦ providing a method of conveying and blending solid particulate 9 ¦ material comprising the steps of providing a vessel having an 10 ¦ inlet in the bottom thereof and a hollow, open-ended vertical 11 ¦ column mounted therein aligned with the inlet and spaced from 12 the bottom of the vessel; establishing a flow of gaseous fluid 13 ¦ through a conveying line to said inlet of the vessel; introducing 14 ¦ solid particulate material to be blended into the flow of gaseous 15 ¦ fluid whereby the material is entrained in the gaseous fluid and 16 ¦ conveyed by the gaseous fluid to the inlet of the vessel, up 17 ¦ through the column and discharged in a geyser-like manner into 18 the vessel; and independently supplying additional gas under 19 ¦ pressure to the bottom of said vessel adjacent the column for
23 A blender which combines some of the features of the prior 24 art is shown in US. Patent No. 3,276,753 wherein a device is sown which is capable of being filled with material to be 26 blended from either a top fill point or a bottom fill point which 27 is directly connected to an air lift column mounted in the 28 material bin. With that device it was considered that some 29 blending occurred in the filling of the bin, it was apparently considered necessary to have withdrawal from several points and 31~
I external recirculation of material to achieve adequate blending.
2 ¦ By the present invention, Applicants have provided a 3 ¦ blending apparatus and system which is capable of combining the 4 ¦ advantages of several of the prior art blenders and is able to do 5 ¦ so at an economical cost. With the present invention a bin 6 ¦ already in existence which is presently being used for storage 7 ¦ can be converted by an economical means to a blending system 8 ¦ which is particularly adapted for use with plastic pellets such 9 ¦ as polyethylene pellets. The invention is also suitable for all 10 ¦ solid particulate material including but not limited to cement 11 ¦ raw meal, powders, sand and the like.
12 ¦ The present invention has several advantages over the prior 13 ¦ art blenders in that is utilizes the conveying system energy to 14 ¦ not only supply material to the storage bin but also to provide 15 ¦ continuous blending of the material from the beginning of the 16 ¦ filling cycle to the end of the filling cycle to thereby cut down 17 ¦ on production time and save energy. The blender of the present 18 invention saves substantial capital investment by a simple con-19 struction of a single blender column because material it supplied to the bottom of the blender and removed from the bottom of the 21 blender. Less piping is required when compared to prior art 22 devices where material is supplied to the top of the blending 23 bin. The blender can eliminate the external piping associated 24 with a tube type gravity blender when required for material recirculation. While internal circulation of materials is 26 contemplated by thy present inventiorl, blending internally -27 results in less depredation of product when compared to external 28 recirculation.
29 With the blender of the present invention, a means is pro-voided for supplying a booster or fluidizing gas to the bottom of lo 142 I ¦ the bin to not only improve blending capability but also to serve 2 ¦ to deduct or clean the material and remove or vent gas which may 3 be trapped within the bin or vessel. Boost gas can also be used 4 to aid in the transfer of material to other destinations after blending is completed. The boost gas or fluidizing gas also 6 assists in the uniform flow of material, particularly during the 7 withdrawal of material from the bin.
9 It is, therefore, the principal object of this invention to provide a process and apparatus for blending for solid part-11 curate material such as pellets, granules, or powders which 12 provides simplified construction and maximum utilization of 13 energy.
14 It is a further object of this invention to provide a Noah-matte conveying and material blending system and method which 16 utilizes the energy used for pneumatic conveying to achieve the 17 blending of the material and utilizes the dust collector fan to 18 both reduce the energy required to blend the material and serve 19 as a pellet cleaning system and degasifying system.
The foregoing and other objects will be carried out by 21 providing in general a pneumatic conveying and material blending 22 system comprising a bin having an inlet for solid particulate 23 material in the bottom thereof; a hollow, open-ended vertical 24 column mounted in said bin, spaced from the bottom of said bin and spaced from and coccal aligned with the inlet for 26 material; means for supplying a stream of gaseous fluid and 27 entrained fresh solid particulate material to be blended to said 28 inlet and upwardly through said column and means for supplying 29 booster gas to the bottom of said bin to be directed upwardly into said column; said means for supplying a stream of gaseous lZ1~142 . .. .
. I fluid and said means for supplying booster gas defining means for 21 conveying solid particulate material already in the bin upwardly 31 through the column whereby said fresh solid particulate material 41 and said solid particulate material already in the bin are disk 5 ¦ pursed on the top surface of material in the bin to thereby blend 6 ¦ the material.
7 ¦ The foregoing and other objects will also be carried out by 8 ¦ providing a method of conveying and blending solid particulate 9 ¦ material comprising the steps of providing a vessel having an 10 ¦ inlet in the bottom thereof and a hollow, open-ended vertical 11 ¦ column mounted therein aligned with the inlet and spaced from 12 the bottom of the vessel; establishing a flow of gaseous fluid 13 ¦ through a conveying line to said inlet of the vessel; introducing 14 ¦ solid particulate material to be blended into the flow of gaseous 15 ¦ fluid whereby the material is entrained in the gaseous fluid and 16 ¦ conveyed by the gaseous fluid to the inlet of the vessel, up 17 ¦ through the column and discharged in a geyser-like manner into 18 the vessel; and independently supplying additional gas under 19 ¦ pressure to the bottom of said vessel adjacent the column for
20 ¦ assisting material already in the vessel to be drawn into and
21 ¦ conveyed up the column where it is intimately mixed with material
22 ¦ being conveyed to the vessel to thereby blend the material.
23 ¦ BRIEF DESCRIPTION OF THE DRAWINGS
24 ¦ The invention will be descried in connection with the
25 ¦ annexed drawings wherein:
26 ¦ Fig. 1 is a diagrammatic view of a pneumatic conveying and
27 I blending system according to the present invention;
28 ¦ Fig. 2 is a view of the inside of a blending vessel
29 ¦ according to the present invention;
30 ¦ Fig. 3 is a sectional view on an enlarged scale of a portion I ~2~1142 . - .
I
1 of a blending column used in one embodiment of the present 2 invention;
3 Fig. 4 is a sectional view taken on the line 4-4 of Fig. 2 4 looking in the direction of the arrows; and Fig. 5 is a fragmentary view of a portion of a blender 6 ¦ according to a further embodiment of the present invention.
7 ¦ DESCRIPTION OF THE PREFERRED EMBODIMENTS
8 ¦ Referring initially to Fig. 1, there is shown a pneumatic 9 ¦ conveying and blending system according to the present invention.
10 ¦ The system includes a pneumatic conveying system generally I ¦ indicated at 1, a blending vessel generally indicated at 2 and a 12¦ dust collection system generally indicated at 3.
13 ¦ The pneumatic conveying system includes a bin 5 having an 14 ¦ outlet 6 controlled by a valve diagrammatically indicated at 7 15 ¦ for controlling the flow of solid particulate material to be 16 ¦ blended into a pneumatic conveying line 8. A blower 9 driven by 17 a motor means 10 supplies gaseous fluid such as air under 18 pressure to the pneumatic conveying line 8 for entraining solid 19 particulate material to be blended and conveying the same through 20 ¦ the line 8 to the blending bin 2. Such a pneumatic conveying 21 system is well known to those having ordinary skill in the art.
22 While we have illustrated the use of a blower g, it will be 23 understood by those skilled in the art that other sources of gas 24 ¦ under pressure such as plant air or a central source of inert gas 25 ¦ could be used for conveying.
26 ¦ Referring to Fig. 2, the blending vessel 2 is shown in 27 greater detail and consists of a bin 15 having a conical bottom 28 ¦ 16 and an inlet 17 centrally located in the bottom 18 of the bin.
29 ¦ The bin also includes a vent 19 in the top thereof. The bin 15 30 ¦ has an open-ended vertically oriented column 25 mounted therein ~21~Ll~;Z
. l , , .
` .1 1 1 by means of longitudinally spaced apart mounting brackets 26, 27 2¦ and 280 These brackets are circumferential spaced apart as
I
1 of a blending column used in one embodiment of the present 2 invention;
3 Fig. 4 is a sectional view taken on the line 4-4 of Fig. 2 4 looking in the direction of the arrows; and Fig. 5 is a fragmentary view of a portion of a blender 6 ¦ according to a further embodiment of the present invention.
7 ¦ DESCRIPTION OF THE PREFERRED EMBODIMENTS
8 ¦ Referring initially to Fig. 1, there is shown a pneumatic 9 ¦ conveying and blending system according to the present invention.
10 ¦ The system includes a pneumatic conveying system generally I ¦ indicated at 1, a blending vessel generally indicated at 2 and a 12¦ dust collection system generally indicated at 3.
13 ¦ The pneumatic conveying system includes a bin 5 having an 14 ¦ outlet 6 controlled by a valve diagrammatically indicated at 7 15 ¦ for controlling the flow of solid particulate material to be 16 ¦ blended into a pneumatic conveying line 8. A blower 9 driven by 17 a motor means 10 supplies gaseous fluid such as air under 18 pressure to the pneumatic conveying line 8 for entraining solid 19 particulate material to be blended and conveying the same through 20 ¦ the line 8 to the blending bin 2. Such a pneumatic conveying 21 system is well known to those having ordinary skill in the art.
22 While we have illustrated the use of a blower g, it will be 23 understood by those skilled in the art that other sources of gas 24 ¦ under pressure such as plant air or a central source of inert gas 25 ¦ could be used for conveying.
26 ¦ Referring to Fig. 2, the blending vessel 2 is shown in 27 greater detail and consists of a bin 15 having a conical bottom 28 ¦ 16 and an inlet 17 centrally located in the bottom 18 of the bin.
29 ¦ The bin also includes a vent 19 in the top thereof. The bin 15 30 ¦ has an open-ended vertically oriented column 25 mounted therein ~21~Ll~;Z
. l , , .
` .1 1 1 by means of longitudinally spaced apart mounting brackets 26, 27 2¦ and 280 These brackets are circumferential spaced apart as
31 shown in Fig. 4. The column 25 has a lower end 30 spaced from 41 the bottom 18 of the bin 15 and a top end 31.
5 ¦ Also mounted within the bin 15 is a deflector means 35 shown 6 ¦ in the form of a "Chinese hat at the top thereof as indicated at 7 ¦ 36 and a conical portion 37 pointed downwardly towards but spaced 8 ¦ from the top 31 of the column 25. The deflector means 35 is 9 ¦ mounted by means of brackets 38 and 39. Other suitable arrange-10 ¦ mints for mounting the deflector are contemplated by the present 11 ¦ invention and will be apparent to those having ordinary skill in 12 ¦ the art.
13 ¦ The bin 15 also includes an outlet which is integral with 14 ¦ the inlet 17. The outlet is actually formed by a material con-15 ¦ vying conduit 40 which meets with the pneumatic conveying line 8 16 ¦ at a diverter valve 41 positioned in conveying line 8. Diverter 17 valves are known to those skilled in the art and can be adjusted 18 between a position which permits material to be supplied to the 19 vessel through conduit 8 and inlet 17 and a position which per mitt material to be withdrawn from the vessel through inlet 17 21 and the branch line 40 which serves as the outlet for the vessel.
22 A cut off gate 43 may also be used at the inlet/outlet 17.
23 The bottom 18 of the bin includes a pheromones or gas per-24 Mobil surface 50 near the bottom 30 of column 25. The gas per-Mobil section 50 may be surrounded by a manifold 51 which is 26 connected to some source of gas. In Fig. 2 the manifold 51 is 27 connected to such source of gas or ambient air by means of a 28 conduit 52. The conduit 52 may also be connected to a source of 29 gas under pressure such as a blower 55 illustrated in Fig. 1. In the alternate, the gas permeable surface 50 may be simply exposed .
121~14Z
' ,. ..
1 1 to atmosphere. -I The pheromones surface 50 may take the form of a gas 3 ¦ permeable fabric, a metal plate with a plurality of holes 4 ¦ these trough, or a plurality of circumferential spaced apart 5 ¦ jets or nozzles extending into the bottom of the cone 16 and flow 6 ¦ connected to an a~lular manifold surrounding the bottom 18 of the 7 ¦ vessel. The important concept is that additional gas under 8 ¦ pressure is to ye supplied to the bottom of the vessel adjacent 9 ¦ the bottom of the column 25.
10 ¦ The vent 19 is connected through a conduit 60 to the dust 11 ¦ collection system 3. The dust collection system may include a 12¦ suitable high efficiency dust collector indicated at 61. In the 13 ¦ preferred embodiment, the dust collector has the fan on the down 14 ¦ stream side of the collector as indicated at 62 connected to the collector 61 by means of a duct 63 and vents to atmosphere. The 16 I fan 62 serves to draw a vacuum through the collector 61, duct 60 17 ¦ and blending vessel 2.
18 ¦ In operation, the method of conveying and blending solid 19 ¦ particulate material is carried out by establishing a flow of 20 ¦ gaseous fluid from a source such as blower 9 through conveying 21 I line 8 to inlet 17 of vessel 15. Fresh solid particulate 22 ¦ material to be blended is introduced into the flow of gaseous 23 ¦ fluid from the source 5 through the valve 7 into the pneumatic 24 ¦ conveying line 8 whereby the material is entrained in the gaseous 25 ¦ fluid and conveyed through diverter valve 41, past open cut off 26 ¦ gate 43 to inlet 17. The energy in the gas under pressure used 27 ¦ to convey the fresh material to be blended serves to convey the I ¦ fresh solid particulate material up through the column 25. As 29 ¦ the material is conveyed up through the column it is discharged 30 ¦ out of the column in a geyser like manner to be dispersed I ~42 . .., .
. I : . .
l ¦ outwardly into the bin 15 where it falls down into the vessel.
2 ¦ As material is continuously conveyed into the bin 15, additional 3 ¦ gas under pressure is independently supplied to the bottom 18 of 4 ¦ the vessel adjacent column 25 through pheromones surface 50 for 5 I ~luidizing material adjacent the bottom of the column and I-' 6 ¦ assisting material already in the bin to be drawn past the bottom 7 I 30 of column 25 into the inlet or bottom 30 of the column 25 to 8 ¦ be conveyed upwardly through the column where it is intimately 9 I mixed with the incoming material to be dispersed outwardly into lo ¦ the bin onto the top surface of material already in the bin and 11 ¦ thereby blend the material. See the arrows in Fig. 2 designating 12 ¦ material flow. The deflector means 35 serves to assist in 13 ¦ dispersal of the material throughout the cross sectional area of 14 I the bin.
15 ¦ By the present invention, the booster gas supplied through 16 ¦ the pheromones or gas permeable surface 50 serves to assist the 17 flow of material up through the column 25 and assist in the 18 drawing or conveying of material already in the vessel into the 19 lower end 30 of column 25. In one embodiment this booster gas can be supplied by a blower such as 55 in Fig. 1. In another 21 embodiment, the booster gas can also be supplied by means of the 22 manifold 51 being connected to atmosphere and the fan 62 drawing 23 a vacuum through the blending vessel 2 to draw ambient air into 24 connection 52, manifold 51, through gas permeable surface 50 into the vessel 15. Most of the vacuum will be drawn within the 26 column 25 to aid in material flowing up through the column 25 to 27 assist in blending material. It should be noted that while in 28 most applications it may not be desirable to rely on a vacuum to 29 draw boost gas through pheromones surface 50 due to high pressure drop, the vacuum drawn on the vessel will still serve to aid in I
~1213~1~2 I I blending.
21 The flow of gas through the blending vessel 2 by means of 3 ¦ the dust collection system 3 and/ox positive gas flow from blower 4 ¦ 55 serves two functions in addition to that of aiding material 5 ¦ flow both broadly considered to be cleaning functions. First, 6 ¦ the flow of gas continuously up through the blending vessel 2 7 ¦ serves to remove toxic or other undesirable gas which may be 8 ¦ trapped within the bin 15. These gases tend to develop in a 9 ¦ system used for blending and storing plastic pellets. Where toxic 10 ¦ fumes are present, it may be desirable to use a wet scrubber in 11 ¦ lieu of the dust collector 61.
12 ¦ A second cleaning advantage of booster gas is the continuous 13 ¦ flow of gas through the blending vessel 2 serves to remove undo-14 ¦ sizable fine material which may be contained within the plastic 15 ¦ pellets or other material being blended by entraining such fines 16 ¦ out through the vent 19 into the dust collector 61. The velocity 17 ¦ of the gas must be such that the undesired fines are entrained 18 out of the system, but the larger desired material is retained in 19 the vessel 15 to thereby serve to clean the material being blended.
21 A third function of the boost gas is to aid in withdrawal of 22 material from the bin. During withdrawal, material may tend to 23 bridge the gap between the bottom of the vessel at 18 and the 24 bottom of the column at 30 or cling to the sides of the vessel.
The roost gas will aerate or fluids the material in the bottom 26 section to aid in the uniform movement of material out of the 27 vessel.
28 With the prior art as illustrated by US. Patent No.
29 3,276,753, it was known to utilize a vacuum applied to the blending, conveying system to introduce material into the 1 ¦ blend g bin. With the present invention, the vacuum or booster 21 gas is used primarily for assisting the blending or gas removal 3 ¦ or particle cleaning. The booster gas is primarily drawn 41 upwardly through the column 25 so that cleaning and gas removal 5 ¦ will take place as the bin 15 is filled and material is being ¦ blended.
7 ¦ It has been found that the convoying of the material into 8 I the bottom of the blender with the present invention serves to 9 ¦ adequately blend the material without the use of additional 10¦ columns as shown in the prior art. The vessel can then be used 11 ¦ to store the blended material until it is time to utilize the 12 I same.
13 ¦ While in most applications it is believed that adequate 14 ¦ material blending will occur with a single feeding of material to 15 ¦ the blender, in some applications it may be necessary to utilize 16 ¦ recirculation in order to achieve the desired mixing. With the 17 ¦ present invention, this further blending is accomplished by an 18 internal recirculation. The introduction of fresh material into 19 ¦ the conveying line 8 is stopped by closing valve 7 while 20 ¦ maintaining the flow of gaseous fluid from a source such as 21 ¦ blower 9 to the inlet 17 of vessel 15. This serves to 22 ¦ continuously recirculate material in the bin up through column 25 23 ¦ for dispersal in a geyser-line or percolator manner onto the top 24 ¦ surface of Metro in the bin. It may or may not be necessary 25 ¦ to continuously supply boost gas through surface 50 during 26 ¦ recirculation, depending on the specific material being blended.
27 ¦ For purposes of withdrawal, the valve 43 is opened and 28 ¦ diverter valve 41 is adjusted to open outlet conduit 40 at the 29 ¦ same time closing inlet conduit 8 to draw material to a use 30 ¦ point. Because in some applications the material may tend to L~L4~
-.. I . - ' 1 ¦ layer within the blender, particularly once withdrawal begins 21 because of the material sticking to the sides of the vessel, and 31 in order to insure that the last material which is conveyed to I the bin 15 is blended with other material therein, for some 51 applications, it may be necessary to add a plurality of slots 70 6 ¦ to column 25 as illustrated in Fig. 3. The slots 70 are 7 ¦ circumferential spaced around the circumference of column 25 8 ¦ and also longitudinally spaced from each other along the length 9 ¦ of the column. In most applications, these slots may not be 10 ¦ used, but when used, it is believed that it will only be 11 ¦ necessary to provide the slows 70 near the top 31 of column 25, 12 I but in some instances it may be advisable to include such slots 13 ¦ along the entire length thereof. These slots are generally shown 14 I in US. Patent No. 3,647,188.
15 ¦ In some applications it may be desirable to provide a means 16 ¦ for adjusting the distance between the bottom 30 of column 25 and 17 the conical section 16 of the vessel 15. For such applications, 18 we have illustrated in Fig. 5 a telescoping section 80 which may 19 be mounted on the bottom 31 of column 30 to provide a means for adjusting the distance between the column and the bin bottom.
21 This adjustment will help control the volume of material already 22 in the bin which is recirculated through the column 25.
23 From the foregoing, it should be apparent that the objects 24 of the present invention have been carried out. A very simple blending system has been provided. In fact, the blender can be 26 made out of an existing storage silo by the mere audition of the 27 bottom feed point for the silo and the addition of the central 28 open-ended column 25. The booster gas can be the exhaust gas 29 from some other source, it could be plant air, or it can be the vacuum created by the vent system of the existing bin. Because L2~14Z
1- . . .
. , I , . .
¦ of the bottom feed to the silo expensive piping and associated 2 ¦ air requirements for conveying material Jo a top inlet for the 3 ¦ vessel is not required. All of the valves, such as valves 41 and 4 I 43 are located at the bottom of the system for each maintenance 5 ¦ accessibility. The system is further simplified when compared 6 ¦ with prior art devices because all of the equipment required for 7 external recirculation of material has been eliminated.
8 ¦ The present invention provides an efficient blender because 9 ¦ incoming fresh material is continuously intermingled with mate-lo I fiat already in the blender. There is continuous blending from if ¦ the beginning of the fill cycle until the end of the fill cycle 12 ¦ which reduces on production time when compared with prior art 13 ¦ blenders. The constant purging of the vessel by the booster gas 14 ¦ serves to drive off unwanted gas and remove fines which is not 15 ¦ accomplished in a single operation by apparatus of the prior art.
16 ¦ Due to the lower velocity of material within the bin 15, it 17 ¦ is believed that there will be a reduction in the degradation of 18 the product and thereby reduce the production of fines. With lo I prior blenders which required continuous recirculation, there was 20 ¦ a tendency to produce such undesirable fines.
21 ¦ While the system has been shown in Fig. 1 with the vent 19 22 ¦ directly connected to a dust collection system, it will be under-23 ¦ stood by those skilled in the art that in some cases, a large 24 ¦ vent could be used which is not directly connected to a dust 25 ¦ collector. Fig. 1 also illustrates a discharge of collected dust 26 ¦ from the system. In some cases it may be desirable to return the 27 ¦ dust to the bin for further blending.
28 I It is intended that the foregoing description be merely that 29 ¦ of preferred embodiments and that the invention be limited solely 30 ¦ by that which is within the scope of the appended claims.
5 ¦ Also mounted within the bin 15 is a deflector means 35 shown 6 ¦ in the form of a "Chinese hat at the top thereof as indicated at 7 ¦ 36 and a conical portion 37 pointed downwardly towards but spaced 8 ¦ from the top 31 of the column 25. The deflector means 35 is 9 ¦ mounted by means of brackets 38 and 39. Other suitable arrange-10 ¦ mints for mounting the deflector are contemplated by the present 11 ¦ invention and will be apparent to those having ordinary skill in 12 ¦ the art.
13 ¦ The bin 15 also includes an outlet which is integral with 14 ¦ the inlet 17. The outlet is actually formed by a material con-15 ¦ vying conduit 40 which meets with the pneumatic conveying line 8 16 ¦ at a diverter valve 41 positioned in conveying line 8. Diverter 17 valves are known to those skilled in the art and can be adjusted 18 between a position which permits material to be supplied to the 19 vessel through conduit 8 and inlet 17 and a position which per mitt material to be withdrawn from the vessel through inlet 17 21 and the branch line 40 which serves as the outlet for the vessel.
22 A cut off gate 43 may also be used at the inlet/outlet 17.
23 The bottom 18 of the bin includes a pheromones or gas per-24 Mobil surface 50 near the bottom 30 of column 25. The gas per-Mobil section 50 may be surrounded by a manifold 51 which is 26 connected to some source of gas. In Fig. 2 the manifold 51 is 27 connected to such source of gas or ambient air by means of a 28 conduit 52. The conduit 52 may also be connected to a source of 29 gas under pressure such as a blower 55 illustrated in Fig. 1. In the alternate, the gas permeable surface 50 may be simply exposed .
121~14Z
' ,. ..
1 1 to atmosphere. -I The pheromones surface 50 may take the form of a gas 3 ¦ permeable fabric, a metal plate with a plurality of holes 4 ¦ these trough, or a plurality of circumferential spaced apart 5 ¦ jets or nozzles extending into the bottom of the cone 16 and flow 6 ¦ connected to an a~lular manifold surrounding the bottom 18 of the 7 ¦ vessel. The important concept is that additional gas under 8 ¦ pressure is to ye supplied to the bottom of the vessel adjacent 9 ¦ the bottom of the column 25.
10 ¦ The vent 19 is connected through a conduit 60 to the dust 11 ¦ collection system 3. The dust collection system may include a 12¦ suitable high efficiency dust collector indicated at 61. In the 13 ¦ preferred embodiment, the dust collector has the fan on the down 14 ¦ stream side of the collector as indicated at 62 connected to the collector 61 by means of a duct 63 and vents to atmosphere. The 16 I fan 62 serves to draw a vacuum through the collector 61, duct 60 17 ¦ and blending vessel 2.
18 ¦ In operation, the method of conveying and blending solid 19 ¦ particulate material is carried out by establishing a flow of 20 ¦ gaseous fluid from a source such as blower 9 through conveying 21 I line 8 to inlet 17 of vessel 15. Fresh solid particulate 22 ¦ material to be blended is introduced into the flow of gaseous 23 ¦ fluid from the source 5 through the valve 7 into the pneumatic 24 ¦ conveying line 8 whereby the material is entrained in the gaseous 25 ¦ fluid and conveyed through diverter valve 41, past open cut off 26 ¦ gate 43 to inlet 17. The energy in the gas under pressure used 27 ¦ to convey the fresh material to be blended serves to convey the I ¦ fresh solid particulate material up through the column 25. As 29 ¦ the material is conveyed up through the column it is discharged 30 ¦ out of the column in a geyser like manner to be dispersed I ~42 . .., .
. I : . .
l ¦ outwardly into the bin 15 where it falls down into the vessel.
2 ¦ As material is continuously conveyed into the bin 15, additional 3 ¦ gas under pressure is independently supplied to the bottom 18 of 4 ¦ the vessel adjacent column 25 through pheromones surface 50 for 5 I ~luidizing material adjacent the bottom of the column and I-' 6 ¦ assisting material already in the bin to be drawn past the bottom 7 I 30 of column 25 into the inlet or bottom 30 of the column 25 to 8 ¦ be conveyed upwardly through the column where it is intimately 9 I mixed with the incoming material to be dispersed outwardly into lo ¦ the bin onto the top surface of material already in the bin and 11 ¦ thereby blend the material. See the arrows in Fig. 2 designating 12 ¦ material flow. The deflector means 35 serves to assist in 13 ¦ dispersal of the material throughout the cross sectional area of 14 I the bin.
15 ¦ By the present invention, the booster gas supplied through 16 ¦ the pheromones or gas permeable surface 50 serves to assist the 17 flow of material up through the column 25 and assist in the 18 drawing or conveying of material already in the vessel into the 19 lower end 30 of column 25. In one embodiment this booster gas can be supplied by a blower such as 55 in Fig. 1. In another 21 embodiment, the booster gas can also be supplied by means of the 22 manifold 51 being connected to atmosphere and the fan 62 drawing 23 a vacuum through the blending vessel 2 to draw ambient air into 24 connection 52, manifold 51, through gas permeable surface 50 into the vessel 15. Most of the vacuum will be drawn within the 26 column 25 to aid in material flowing up through the column 25 to 27 assist in blending material. It should be noted that while in 28 most applications it may not be desirable to rely on a vacuum to 29 draw boost gas through pheromones surface 50 due to high pressure drop, the vacuum drawn on the vessel will still serve to aid in I
~1213~1~2 I I blending.
21 The flow of gas through the blending vessel 2 by means of 3 ¦ the dust collection system 3 and/ox positive gas flow from blower 4 ¦ 55 serves two functions in addition to that of aiding material 5 ¦ flow both broadly considered to be cleaning functions. First, 6 ¦ the flow of gas continuously up through the blending vessel 2 7 ¦ serves to remove toxic or other undesirable gas which may be 8 ¦ trapped within the bin 15. These gases tend to develop in a 9 ¦ system used for blending and storing plastic pellets. Where toxic 10 ¦ fumes are present, it may be desirable to use a wet scrubber in 11 ¦ lieu of the dust collector 61.
12 ¦ A second cleaning advantage of booster gas is the continuous 13 ¦ flow of gas through the blending vessel 2 serves to remove undo-14 ¦ sizable fine material which may be contained within the plastic 15 ¦ pellets or other material being blended by entraining such fines 16 ¦ out through the vent 19 into the dust collector 61. The velocity 17 ¦ of the gas must be such that the undesired fines are entrained 18 out of the system, but the larger desired material is retained in 19 the vessel 15 to thereby serve to clean the material being blended.
21 A third function of the boost gas is to aid in withdrawal of 22 material from the bin. During withdrawal, material may tend to 23 bridge the gap between the bottom of the vessel at 18 and the 24 bottom of the column at 30 or cling to the sides of the vessel.
The roost gas will aerate or fluids the material in the bottom 26 section to aid in the uniform movement of material out of the 27 vessel.
28 With the prior art as illustrated by US. Patent No.
29 3,276,753, it was known to utilize a vacuum applied to the blending, conveying system to introduce material into the 1 ¦ blend g bin. With the present invention, the vacuum or booster 21 gas is used primarily for assisting the blending or gas removal 3 ¦ or particle cleaning. The booster gas is primarily drawn 41 upwardly through the column 25 so that cleaning and gas removal 5 ¦ will take place as the bin 15 is filled and material is being ¦ blended.
7 ¦ It has been found that the convoying of the material into 8 I the bottom of the blender with the present invention serves to 9 ¦ adequately blend the material without the use of additional 10¦ columns as shown in the prior art. The vessel can then be used 11 ¦ to store the blended material until it is time to utilize the 12 I same.
13 ¦ While in most applications it is believed that adequate 14 ¦ material blending will occur with a single feeding of material to 15 ¦ the blender, in some applications it may be necessary to utilize 16 ¦ recirculation in order to achieve the desired mixing. With the 17 ¦ present invention, this further blending is accomplished by an 18 internal recirculation. The introduction of fresh material into 19 ¦ the conveying line 8 is stopped by closing valve 7 while 20 ¦ maintaining the flow of gaseous fluid from a source such as 21 ¦ blower 9 to the inlet 17 of vessel 15. This serves to 22 ¦ continuously recirculate material in the bin up through column 25 23 ¦ for dispersal in a geyser-line or percolator manner onto the top 24 ¦ surface of Metro in the bin. It may or may not be necessary 25 ¦ to continuously supply boost gas through surface 50 during 26 ¦ recirculation, depending on the specific material being blended.
27 ¦ For purposes of withdrawal, the valve 43 is opened and 28 ¦ diverter valve 41 is adjusted to open outlet conduit 40 at the 29 ¦ same time closing inlet conduit 8 to draw material to a use 30 ¦ point. Because in some applications the material may tend to L~L4~
-.. I . - ' 1 ¦ layer within the blender, particularly once withdrawal begins 21 because of the material sticking to the sides of the vessel, and 31 in order to insure that the last material which is conveyed to I the bin 15 is blended with other material therein, for some 51 applications, it may be necessary to add a plurality of slots 70 6 ¦ to column 25 as illustrated in Fig. 3. The slots 70 are 7 ¦ circumferential spaced around the circumference of column 25 8 ¦ and also longitudinally spaced from each other along the length 9 ¦ of the column. In most applications, these slots may not be 10 ¦ used, but when used, it is believed that it will only be 11 ¦ necessary to provide the slows 70 near the top 31 of column 25, 12 I but in some instances it may be advisable to include such slots 13 ¦ along the entire length thereof. These slots are generally shown 14 I in US. Patent No. 3,647,188.
15 ¦ In some applications it may be desirable to provide a means 16 ¦ for adjusting the distance between the bottom 30 of column 25 and 17 the conical section 16 of the vessel 15. For such applications, 18 we have illustrated in Fig. 5 a telescoping section 80 which may 19 be mounted on the bottom 31 of column 30 to provide a means for adjusting the distance between the column and the bin bottom.
21 This adjustment will help control the volume of material already 22 in the bin which is recirculated through the column 25.
23 From the foregoing, it should be apparent that the objects 24 of the present invention have been carried out. A very simple blending system has been provided. In fact, the blender can be 26 made out of an existing storage silo by the mere audition of the 27 bottom feed point for the silo and the addition of the central 28 open-ended column 25. The booster gas can be the exhaust gas 29 from some other source, it could be plant air, or it can be the vacuum created by the vent system of the existing bin. Because L2~14Z
1- . . .
. , I , . .
¦ of the bottom feed to the silo expensive piping and associated 2 ¦ air requirements for conveying material Jo a top inlet for the 3 ¦ vessel is not required. All of the valves, such as valves 41 and 4 I 43 are located at the bottom of the system for each maintenance 5 ¦ accessibility. The system is further simplified when compared 6 ¦ with prior art devices because all of the equipment required for 7 external recirculation of material has been eliminated.
8 ¦ The present invention provides an efficient blender because 9 ¦ incoming fresh material is continuously intermingled with mate-lo I fiat already in the blender. There is continuous blending from if ¦ the beginning of the fill cycle until the end of the fill cycle 12 ¦ which reduces on production time when compared with prior art 13 ¦ blenders. The constant purging of the vessel by the booster gas 14 ¦ serves to drive off unwanted gas and remove fines which is not 15 ¦ accomplished in a single operation by apparatus of the prior art.
16 ¦ Due to the lower velocity of material within the bin 15, it 17 ¦ is believed that there will be a reduction in the degradation of 18 the product and thereby reduce the production of fines. With lo I prior blenders which required continuous recirculation, there was 20 ¦ a tendency to produce such undesirable fines.
21 ¦ While the system has been shown in Fig. 1 with the vent 19 22 ¦ directly connected to a dust collection system, it will be under-23 ¦ stood by those skilled in the art that in some cases, a large 24 ¦ vent could be used which is not directly connected to a dust 25 ¦ collector. Fig. 1 also illustrates a discharge of collected dust 26 ¦ from the system. In some cases it may be desirable to return the 27 ¦ dust to the bin for further blending.
28 I It is intended that the foregoing description be merely that 29 ¦ of preferred embodiments and that the invention be limited solely 30 ¦ by that which is within the scope of the appended claims.
Claims (5)
1. A pneumatic conveying and material blending system comprising a bin having a bottom and a top, an inlet for solid particulate material in the bottom of the bin; a hollow, open-ended vertical column mounted in said bin, spaced from the bottom of said bin and spaced from and coaxially aligned with the inlet for material: means for supplying a stream of gaseous fluid and entrained fresh solid particulate material to be blended to said inlet and upwardly through said column; the bottom of said bin having a foraminous surface adjacent said column; means including said foraminous surface for supplying booster gas to the bottom of said bin to be directed upwardly into said column; said means for supplying a stream of gaseous fluid and entrained fresh material and said means for supplying booster gas defining means for conveying solid particulate material already in the bin upwardly through the column whereby said fresh solid particulate material and said solid particulate material already in the bin are dispersed onto the top surface of material in the bin to thereby blend the material; a manifold externally mounted on said bin surrounding said foraminous surface; and a source of gas under pressure flow connected to said manifold for supplying gas under pressure to said bin for passage upwardly through said bin for entraining solid particulate material already in the bin and removing through said vent fine material which may be contained in the solid particulate material to thereby define a means for cleaning the solid particulate material.
2. pneumatic conveying and blending system according to Claim 1 further comprising means for adjusting the length of the column to thereby adjust the distance between the bottom of said column and the bottom of said bin.
3. A pneumatic conveying and blending system according to Claim 1 further comprising an outlet for blended solid particulate material, said outlet being integral with the inlet for material.
4. A method of conveying and blending solid particulate material comprising the steps of:
providing a vessel having an inlet in the bottom thereof and a hollow, open-ended vertical column mounted therein aligned with the inlet and spaced from the bottom of the vessel;
establishing a flow of gaseous fluid through a conveying line to said inlet of the vessel:
introducing solid particulate material to be blended into the flow of gaseous fluid whereby the material is entrained in the gaseous fluid and conveyed by the gaseous fluid to the inlet of the vessel, up through the column and discharged from the top of the column in a geyser-like manner into the vessel;
independently supplying additional gas under pressure to the bottom of said vessel adjacent the column for assisting material already in the vessel to be drawn into and conveyed up the column where it is intimately mixed with material being conveyed to the vessel to thereby blend the material; and further blending the material by stopping the introduction of material into the flow of gaseous fluid through the conveying line whereby material in the bin is recirculated through the column by means of the flow of gaseous fluid and additional gas.
providing a vessel having an inlet in the bottom thereof and a hollow, open-ended vertical column mounted therein aligned with the inlet and spaced from the bottom of the vessel;
establishing a flow of gaseous fluid through a conveying line to said inlet of the vessel:
introducing solid particulate material to be blended into the flow of gaseous fluid whereby the material is entrained in the gaseous fluid and conveyed by the gaseous fluid to the inlet of the vessel, up through the column and discharged from the top of the column in a geyser-like manner into the vessel;
independently supplying additional gas under pressure to the bottom of said vessel adjacent the column for assisting material already in the vessel to be drawn into and conveyed up the column where it is intimately mixed with material being conveyed to the vessel to thereby blend the material; and further blending the material by stopping the introduction of material into the flow of gaseous fluid through the conveying line whereby material in the bin is recirculated through the column by means of the flow of gaseous fluid and additional gas.
5. A method of conveying and blending solid particulate material according to Claim 4 wherein a diverter valve is mounted in the conveying line adjacent the inlet of the vessel and includes a branch line which serves as an outlet for the vessel, which diverter valve can be adjusted between a position which permits material to be conveyed into the vessel and a position which permits material to be withdrawn from the vessel through the outlet, the method further comprising the step of withdrawing blended material from the vessel by adjusting the diverter valve to permit material to flow through the outlet and stopping the flow of gaseous fluid through the conveying line into the vessel while maintaining the independent supply of additional gas to the bottom of the vessel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08408713A GB2156699B (en) | 1984-04-04 | 1984-04-04 | Pneumatic conveying and material blending apparatus and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1211142A true CA1211142A (en) | 1986-09-09 |
Family
ID=10559174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000450036A Expired CA1211142A (en) | 1984-04-04 | 1984-03-20 | Pneumatic conveying and material blending apparatus and method |
Country Status (5)
| Country | Link |
|---|---|
| AU (1) | AU566269B2 (en) |
| CA (1) | CA1211142A (en) |
| FR (1) | FR2562046A1 (en) |
| GB (1) | GB2156699B (en) |
| ZA (1) | ZA842440B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4978227A (en) * | 1986-04-03 | 1990-12-18 | Fuller Company | Blender for solid particulate material |
| ES2155003B1 (en) * | 1999-01-07 | 2001-11-16 | Fernandez Gregorio Zornoza | MIXING PROCEDURE OF SOLID PRODUCTS AND MACHINE FOR PRACTICE OF THE SAME. |
| CN110201580A (en) * | 2019-06-27 | 2019-09-06 | 佛山市南海东方澳龙制药有限公司 | The mixed preparing device and method of paste |
| CN114471345B (en) * | 2021-12-28 | 2024-07-30 | 昌坚工业(安徽)有限公司 | Full-automatic powder pneumatic conveying system |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL281022A (en) * | ||||
| GB739031A (en) * | 1952-11-15 | 1955-10-26 | Kloeckner Humboldt Deutz Ag | A device for mixing and homogenizing pulverulent or finely granulated substances |
| FR1305783A (en) * | 1961-11-02 | 1962-10-05 | Gouverneur Talc Company | Method and apparatus for pneumatic conveying and packaging |
| US3164376A (en) * | 1963-03-14 | 1965-01-05 | Dow Chemical Co | Blending apparatus |
| US3276753A (en) * | 1964-08-17 | 1966-10-04 | Fuller Co | Apparatus for lifting and blending loose solids |
| US3351326A (en) * | 1964-10-07 | 1967-11-07 | Rexall Drug Chemical | Process and apparatus for solids blending |
| US3258252A (en) * | 1964-12-17 | 1966-06-28 | Union Carbide Corp | Apparatus for blending free-flowing granular materials |
| FR1477702A (en) * | 1966-03-10 | 1967-04-21 | Improvements to devices for entraining a solid by suspending a gas stream and separating the solid after entrainment | |
| DE1902069A1 (en) * | 1969-01-16 | 1970-07-23 | Polysius Ag | Container for holding fine-grained goods |
| DE2001517A1 (en) * | 1970-01-14 | 1971-07-29 | Fritz Loedige | Anticlogging screw mixer |
| US3647188A (en) * | 1970-03-25 | 1972-03-07 | Fuller Co | Airlift blending apparatus |
| DE2219397C3 (en) * | 1972-04-20 | 1975-07-24 | Bayer Ag, 5090 Leverkusen | Container for pneumatic mixing of powdery or granular material |
| US3807705A (en) * | 1972-06-28 | 1974-04-30 | Du Pont | Process and apparatus for solids blending |
| JPS53116562A (en) * | 1977-03-22 | 1978-10-12 | Akoo Kk | Powdery material mixing method and apparatus therefor |
| DE3208499C2 (en) * | 1981-08-18 | 1987-01-15 | Waeschle Maschinenfabrik Gmbh, 7980 Ravensburg | Process and gravity mixer for mixing bulk material |
-
1984
- 1984-03-20 CA CA000450036A patent/CA1211142A/en not_active Expired
- 1984-03-30 FR FR8405102A patent/FR2562046A1/en not_active Withdrawn
- 1984-03-30 ZA ZA842440A patent/ZA842440B/en unknown
- 1984-04-02 AU AU26327/84A patent/AU566269B2/en not_active Ceased
- 1984-04-04 GB GB08408713A patent/GB2156699B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU566269B2 (en) | 1987-10-15 |
| GB2156699B (en) | 1987-11-25 |
| GB2156699A (en) | 1985-10-16 |
| GB8408713D0 (en) | 1984-05-16 |
| ZA842440B (en) | 1984-10-23 |
| FR2562046A1 (en) | 1985-10-04 |
| AU2632784A (en) | 1985-10-10 |
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Legal Events
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| MKEX | Expiry | ||
| MKEX | Expiry |
Effective date: 20040320 |